Gas filling apparatus



FIG. 1 is a front elevational view of the gas filling apparatus of the present invention showing our new design, the rear elevational view being identical to the front elevational view;

FIG. 2 is a right-side elevational view thereof, the left-side elevational view being identical to the right-side elevational view;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a front perspective view thereof.

The broken lines shown in FIGS. 1, 2, 4 and 5 represent portions of a gas filling apparatus and form no part of the claimed design. 

CLAIM The ornamental design for a gas filling apparatus, as shown and described. 